UART has unusual speed: 1500000 boot from SD card is possible by shorting TP50265 to the ground and powering the board. After Armbian boots up, you can overwrite eMMC. You need to do this procedure only once or in case you totally brick your system. once you have Armbian booting from eMMC, you can boot SD card …
Hold power button for about 7-8 seconds to power the device up. Boot log: http://ix.io/1r19 Known problems: HDMI is not working and will probably never, onboard wireless is too fragile, disabled by default.
USB3 sometimes doesn’t detect high-speed devices properly A heat sink is highly recommended if you want to run it at full speed Changing screen resolution
USB3 sometimes doesn’t detect high-speed devices properly
PCIe port is not supported: Allwinner H6 has a quirky PCIe controller that doesn’t map the PCIe address space properly to CPU, and accessing the PCIe config space, IO space or memory space will need to be wrapped. As Linux doesn’t wrap PCIe memory space access, it’s not possible to do a proper PCIe controller …
You need to hold boot key and power/reset the device to force boot from SD card, Shutdown doesn’t work properly. It reboots the board. Devices, which memory number begins with SEC710 K4B4G16, need to do.: https://forum.armbian.com/topic/7274-nanopc-t3-boot-troubles/page/3/?tab=comments#comment-83688